With the extradition and arrest of two more key G20 suspects this week, Toronto Police are “nearing the end” of a lengthy investigation that began almost three years ago, when Black Bloc protesters unleashed a torrent of damage in the city core.

Americans Kevin Chianella, 20, and Richard Dean Morano, 22, appeared in court Wednesday on a host of charges related to their alleged participation in the June 2010 riots, which triggered the largest mass arrest in Canadian history and an ensuing wave of civil-rights complaints.

Investigators probing the events of June 26 — when violent demonstrators hijacked an otherwise peaceful protest — identified nearly four dozen alleged perpetrators that day, and have been tracking their cases through the courts. Most have since pleaded guilty or been found guilty at trial, receiving sentences ranging from probation to more than a year in prison. The stiffest penalty, 21 months of jail time, went to arsonist Lekang Mdlongwa, who was convicted of torching a police cruiser.

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“We’re well on the way to completing our original task. It’s taken over two-and-a-half years to do it, but we’re nearing the end,” lead investigator Det.-Sgt. Gary Giroux said Wednesday.

Mr. Chianella was allegedly among the worst of the G20 offenders, causing an estimated $300,000 worth of property damage by hurling rocks and chairs through plate glass windows, helping to torch a police vehicle and smashing an ATM. Mr. Morano is accused of similar conduct that resulted in about $25,000 worth of damage.

“I was always tasked with holding the people responsible accountable, and I took it seriously, and that theme continues,” Det.-Sgt. Giroux said.

Charges have been stayed, dismissed or withdrawn against a handful of others arrested as part of the June 26 group, while two more — Youri Couture and Guillaune Constantineau — were scheduled for a joint trial in September on charges including mischief and assaulting a police officer.

Rounding out the list, Mr. Chianella and Mr. Morano were among five American suspects who have yet to be prosecuted. Toronto Police nabbed Quinn McCormic last week, while investigators were still working to extradite Joel Bitar and Dane Rossman.

Det.-Sgt. Giroux’s investigative group focused exclusively on the June 26 perpetrators, but over the course of the G20 weekend, more than 1,000 people were arrested. Most were held for breaching the peace and released without charges, while another 200 people had their charges dropped. In total, more than four dozen people have been convicted.